Suicidal, explosive mechanoids introduced in Mega Man 3. Walking Bombs mindlessly patrol the areas they're programmed to guard until they spot an intruder, at which time they unerringly proceed towards their target, instantly exploding if they make physical contact. Walking Bombs aren't very intelligent and can be easily avoided and/or tricked into destroying themselves. Because of the large load of explosives they carry internally and their almost nonexistant armor plating, Walking Bombs are very vulnerable to weapons fire of almost any type.

It will forever remain a mystery to me why these bots weren't resurrected for Grenade Man's stage in Mega Man 8 - it seems like a no-brainer to me, but Capcom didn't do it...